   * {
           margin: 0px;
           padding: 0px;
       }
       
       .big {
           width: 870px;
           height: 400px;
           margin: 0 auto;
           background-color: bisque;
           box-sizing: border-box;
           padding: 30px;
       }
       
       div img {
           margin: 80px auto auto auto;
       }
       
       header {
           margin: 120px auto auto auto;
       }
       
       header a {
           text-decoration: none;
           background-color: black;
           color: white;
           width: 110px;
           height: 30px;
           display: block;
           border-radius: 2px;
           text-align: center;
       }
       
       header a:hover {
           font-size: 18px;
       }
       
       .small {
           background-color: whitesmoke;
           width: 870px;
           height: 1100px;
           margin: 0 auto;
           box-sizing: border-box;
       }
       
       .second {
           display: block;
           width: 300px;
       }
       
       .small img {
           margin-top: 40px;
           margin-left: 100px;
           box-sizing: border-box;
           vertical-align: middle;
       }
       
       .small h4 {
           margin-left: 100px;
       }
       
       .small p {
           display: block;
           margin-left: 100px;
           width: 300px;
           box-sizing: border-box;
       }
       
       .first h3 {
           margin-left: 100px;
       }
   }
   .xiao {
       margin-left: 400px;
       box-sizing: border-box;
   }
   .hezi {
       margin-left: 405px;
       display: block;
       margin-top: -135px;
   }
   .heizi1 {
       margin-left: 545px;
       display: block;
       margin-top: -148px;
   }
   .first a {
       display: block;
       width: 260px;
       margin-left: 500px;
       margin-top: -970px;
   }